| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_MEMORY_DISCARDABLE_MEMORY_EMULATED_H_ |
| #define BASE_MEMORY_DISCARDABLE_MEMORY_EMULATED_H_ |
| |
| #include "base/memory/discardable_memory.h" |
| |
| #include "base/memory/discardable_memory_manager.h" |
| |
| namespace base { |
| namespace internal { |
| |
| class DiscardableMemoryEmulated |
| : public DiscardableMemory, |
| public internal::DiscardableMemoryManagerAllocation { |
| public: |
| explicit DiscardableMemoryEmulated(size_t bytes); |
| virtual ~DiscardableMemoryEmulated(); |
| |
| static bool ReduceMemoryUsage(); |
| |
| // TODO(reveman): Remove this as it is breaking the discardable memory design |
| // principle that implementations should not rely on information this is |
| // unavailable in kernel space. crbug.com/400423 |
| BASE_EXPORT static void ReduceMemoryUsageUntilWithinLimit(size_t bytes); |
| |
| static void PurgeForTesting(); |
| |
| bool Initialize(); |
| |
| // Overridden from DiscardableMemory: |
| virtual DiscardableMemoryLockStatus Lock() OVERRIDE; |
| virtual void Unlock() OVERRIDE; |
| virtual void* Memory() const OVERRIDE; |
| |
| // Overridden from internal::DiscardableMemoryManagerAllocation: |
| virtual bool AllocateAndAcquireLock() OVERRIDE; |
| virtual void ReleaseLock() OVERRIDE {} |
| virtual void Purge() OVERRIDE; |
| |
| private: |
| const size_t bytes_; |
| scoped_ptr<uint8[]> memory_; |
| bool is_locked_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryEmulated); |
| }; |
| |
| } // namespace internal |
| } // namespace base |
| |
| #endif // BASE_MEMORY_DISCARDABLE_MEMORY_EMULATED_H_ |